#include "Date.h"

void Date::Print()
{
	cout << _year << "-" << _month << "-" << _day << endl;
}

Date::Date(int year, int month, int day)
{
	_year = year;
	_month = month;
	_day = day;
}

bool Date::operator> (const Date& d)
{
	if (_year > d._year)
		return true;
	else if (_year == d._year && _month > d._month)
		return true;
	else if (_year == d._year && _month == d._month && _day > d._day)
		return true;

	return false;
}

bool Date::operator< (const Date& d)
{
	return !((*this > d) || (*this == d));
}

bool Date::operator>= (const Date& d)
{
	return !(*this < d);
}

bool Date::operator<= (const Date& d)
{
	return !(*this > d);
}

bool Date::operator== (const Date& d)
{
	return _year == d._year && _month == d._month && _day == d._day;
}

bool Date::operator!= (const Date& d)
{
	return !(*this == d);
}

int Date::GetMonthDay(int year, int month)
{
	int GetMonth[13] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	if (month == 2 && ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)))
		return GetMonth[month] + 1;

	return GetMonth[month];
}

Date& Date::operator+=(int day)
{
	_day += day;
	while (_day > GetMonthDay(_year, _month))
	{
		_day -= GetMonthDay(_year, _month);
		++_month;

		if (_month == 13)
		{
			++_year;
			_month = 1;
		}
	}

	return *this;
}

Date Date::operator+(int day)
{
	Date tmp(*this);
	tmp += day;

	return tmp;
}

Date& Date::operator-=(int day)
{
	_day -= day;
	while (_day <= 0)
	{
		--_month;
		if (_month == 0)
		{
			--_year;
			_month = 12;
		}

		_day += GetMonthDay(_year, _month);
	}

	return *this;
}

Date Date::operator-(int day)
{
	Date tmp(*this);
	tmp -= day;

	return *this;
}

Date& Date::operator++()
{
	*this += 1;
	return *this;
}

Date  Date::operator++(int)
{
	Date tmp(*this);
	*this += 1;
	return tmp ;
}

Date& Date::operator--()
{
	*this -= 1;
	return *this;
}

Date Date::operator--(int)
{
	Date tmp(*this);
	*this -= 1;
	return tmp;
}

int Date::operator-(const Date& d)
{
	int flag = 1;
	Date max = *this;
	Date min = d;

	if (*this < d)
	{
		max = d;
		min = *this;
		flag = -1;
	}

	int n = 0;
	while (min != max)
	{
		++min;
		++n;
	}

	return n * flag;
}
